Hello - Help with Translation from English to Hawaiin Please?

[llilith]

I am giving my husband a watch for Valentine's Day, and I'd like to have it engraved with a sentiment in Hawaiian. I want to say this:

My love is yours
Until the end of time.

After looking on various translation sites, I think this might be it:

Nau Ko'u Aloha
Mau Loa (or A Mau Loa).

Does anyone know if this is correct or if there is a more appropriate translation?

Thank you in advance for any help!